Sprintcat build

[bustitup]

There is no advantage to running the packs in the sponsons, this boat handles great as you see it and has made official SAW passes in the 80s. While it seems intuitive that a low CG should help handling, in reality this is not the case in the cats I've played with. In fact ten years ago several club members tried it both ways with Key West cats and found that placing the packs on the tunnel gave superior handling



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very interesting news...I would have thought that the lower COG of the batt packs would have helped immensely

[bustitup]

6S2P. Yes, you can't squeeze 5000's into the sponsons. I have some 4350's that will fit. A friend of mine is running two 3S in series and then paralleled with another set. (3S2S2P?)
I didn't think of cutting the lip slightly! I'll check that out. Otherwise I was going to have to order some more 4350 batts! My original plan was to put the batts behind the motor but no way to achieve the COG that way.

hmmmm....my turnigy 6s 5000 30c packs fit fine in the sponsons with a little push

but from what fluid states there is no advantage to put them in there so why bother

[sailr]

Interesting. You also have a lot of 'stuff' up front. Maybe that helps. I trial fitted my 5000 batts behind the motor and NO WAY could I balance it right. There must be a ton of difference in the weight of the turnigy 5000 40C's and the 4500's you're running. What are they?

I run 6S2P/4500s behind the motor and the boat runs great.

[sailr]

How long til I finish? With me, you never know. Haha. I am slow as molasses and usually have several boats and airplanes in various stages of completion. It's whatever I decide to work on today. There is a race in East Florida coming up the end of March so need to have it ready by then!

Looks good so far jim how long untill your finished ?. I got my hull the other day . I also need to cut the stock wood rails out to do what randy did. But i dont feel comfortable doing that with my very limited knowledge of boats . Im thinking about sending it to randy for him to convert instead .

[sailr]

Great! I'll just have to figure out my battery location and still achieve the COG. Where is your COG?

The fan blows into the motor and across the ESC. Helps with cooling since the hull volume is large. Plenty of room for everything necessary and leaves the sponsons for the most important function - flotation! . There is no advantage to running the packs in the sponsons, this boat handles great as you see it and has made official SAW passes in the 80s. While it seems intuitive that a low CG should help handling, in reality this is not the case in the cats I've played with. In fact ten years ago several club members tried it both ways with Key West cats and found that placing the packs on the tunnel gave superior handling on a tight (very tight!) course. I put them where it is easiest, handling is not the issue.

Dakota R/T tailgate.



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[sailr]

I will be running the boat in Q Offshore (6S). What ESC are you using? I have been told the big Feigoa is pretty stingy on the AMPS so I'm going to try a Seaking 180. What prop(s) have you had the best results with?

looking good sailr...what class will you run this boat in?....I may bring mine to race with you...mine has a 580 9l on 6s and 8s

I love the backwards classic hatch....it will look even better if you paint it right



just a note: man you know a guy is doing well when he has a piece of carbon fiber the size of a large table cloth

[sailr]

My packs are 40C's. Must be a tad bigger.

hmmmm....my turnigy 6s 5000 30c packs fit fine in the sponsons with a little push

but from what fluid states there is no advantage to put them in there so why bother

[Rumdog]

I will be running the boat in Q Offshore (6S). What ESC are you using? I have been told the big Feigoa is pretty stingy on the AMPS so I'm going to try a Seaking 180. What prop(s) have you had the best results with?

I ran the 8l on 5s2p with the seaking 180. It was cool as a cucumber. Has anyone ran 6s on these yet?

[Fluid]

I'll just have to figure out my battery location and still achieve the COG. Where is your COG?

Mine seems to run best around 11.25" ahead of the transom depending on the water/wind conditions. Move it fore and aft 1/2" to see what works best for you.




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[sailr]

Good info. A friend of mine has his balanced at 13.5" and his is a speed demon. Seems like yours would have a tendency to fly?

[sailr]

I haven't used on on 6S yet but will definitely disable the BEC!

I ran the 8l on 5s2p with the seaking 180. It was cool as a cucumber. Has anyone ran 6s on these yet?

[Rumdog]

Yep, I don't even use it on 4s! Mine balances at 11.5"

[Rumdog]

Sailr, any update? Photos?

[sailr]

Boat is basically done. Camera broken. Should have it fixed soon!

[Bigmaxy]

Updates?????